1、 IEC/TR 62781 Edition 1.0 2012-09 TECHNICAL REPORT Ultrasonics Conditioning of water for ultrasonic measurements IEC/TR 62781:2012(E)colourinsideCopyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribu
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9、 Service Centre:csciec.ch.Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC/TR 62781 Edition 1.0 2012-09 TECHNICAL REPORT Ultrasonics Conditioning
10、of water for ultrasonic measurements INTERNATIONAL ELECTROTECHNICAL COMMISSION S ICS 17.140.50 PRICE CODE ISBN 978-2-83220-376-7 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distributor.colourinsideCopyr
11、ighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 TR 62781 IEC:2012(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Dissolved ga
12、ses.7 3.1 General.7 3.2 Chemical methods.8 3.2.1 General.8 3.2.2 Addition of sodium sulphite.8 3.3 Physical methods.9 3.3.1 General.9 3.3.2 Vacuum degassing.9 3.3.3 Reduced pressure recirculation.9 3.3.4 Degassing contactors.11 3.3.5 Boiling.11 3.4 Verification methods.11 3.4.1 General.11 3.4.2 Elec
13、trical verification methods.12 3.4.3 Optical verification methods.12 3.5 Re-gassing.12 4 Dissolved ionic content.13 4.1 General.13 4.2 Chemical methods.13 4.2.1 General.13 4.2.2 Ion exchange devices.13 4.3 Physical methods.13 4.3.1 General.13 4.3.2 Distillation.14 4.3.3 Reverse osmosis.14 4.4 Verifi
14、cation methods.14 4.5 Reionization.14 5 Biological content.15 5.1 General.15 5.2 Chemical methods.15 5.2.1 General.15 5.2.2 Addition of chlorine-based chemicals.15 5.2.3 Addition of copper-based chemicals.15 5.2.4 Addition of silver-based chemicals.16 5.3 Physical methods.16 5.3.1 General.16 5.3.2 U
15、V filtration.16 5.3.3 Cavitation methods.16 6 Suspended particulate content.16 6.1 General.16 Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.TR 6278
16、1 IEC:2012(E)3 6.2 Physical methods.17 6.3 Particulate re-contamination.17 7 Water temperature.17 7.1 General.17 7.2 Thermal sources in an ultrasonic measurement tank.18 8 Examples of low-cost water treatment systems.18 8.1 Hydrophone measurement water tank.18 8.2 RFB measurement vessel.19 Bibliography.21 Figure 1 Dissolved oxygen concentration as a function of time for 2,4 and 6 g/l of sodium sulphite in de-mineralised water and for different surface areas and volumes of water.9 Figure 2 Di
